[[*gʰeud-]]
Fragment of a discussion from User talk:Rua
Pokorny says "gut" comes from *ǵhewd; see http://indo-european.info/pokorny-etymological-dictionary/whnjs.htm.
Sorry, the proper link is http://indo-european.info/pokorny-etymological-dictionary/%C4%9Dheu.htm. You can include links by just pasting the raw link, without adding brackets or anything.